Rbmake Book Maker

I wrote this software back when I was heavily into the Rocket eBook and
the REB1100. It takes HTML and/or text files and turns them into an ebook
(in the ".rb" format). The utility is called
rbmake, and it's a command-line
tool, which means that it is targetted at a pretty "techie" audience. At
least two online booksellers were using it to create their non-encrypted
books, so it was pretty useful back in its prime (the book sellers were
FictionWise and
Baen Books).